found important
differences
among
the surfaces of
keratin films plasticized with glycerol, sorbitol and PEG4000 using
a magnification of 2000 and 3000. These higher magnification
levels cannot be used for starch films, because it can degrade them.
On the other hand, the surfaces of films prepared with rice flour
were more irregular than those of films prepared with rice starch.
For flour base films, the presence of insoluble particles was
observed. The irregularities in the surface of rice flour films may be
related to the presence of more than one macromolecule in the
polymeric matrix (starch, protein and lipid).